Chapter 24, Problem 82PQ

To determine

Prove that $\overrightarrow{E}=k\lambda \widehat{j}{\displaystyle \underset{0}{\overset{l}{\int }}\frac{d{y}^{\prime }}{{\left(y-y^{\prime }\right)}^2}}=\frac{k\lambda l}{y\left(y-l\right)}\widehat{j}$ by integration with reference to example 24.8.